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mirror of https://github.com/crskycode/GARbro.git synced 2024-12-24 03:44:13 +08:00
2023-10-27 04:12:32 +04:00

93 lines
3.5 KiB
C#

//! \file AudioWAV.cs
//! \date 2023 Oct 26
//! \brief Obscure C's ware WAVE file encoding.
//
// Copyright (C) 2023 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using GameRes.Utility;
using System;
using System.ComponentModel.Composition;
using System.IO;
// [960405][C's Ware] GLO-RI-A ~Kindan no Ketsuzoku~
namespace GameRes.Formats.CsWare
{
[Export(typeof(AudioFormat))]
[ExportMetadata("Priority", 1)] // should be tried before generic WAVE format
public class WavAudio : AudioFormat
{
public override string Tag => "WAV/CSWARE";
public override string Description => "C's ware encoded audio";
public override uint Signature => 0x46464952; // 'RIFF'
public override bool CanWrite => false;
public override SoundInput TryOpen (IBinaryStream file)
{
var header = file.ReadHeader (0x2E);
if (header[0x14] != 1 || header[0x15] != 0xFF
|| !header.AsciiEqual (8, "WAVEfmt ")
|| !header.AsciiEqual (0x26, "data"))
return null;
var format = new WaveFormat {
FormatTag = 1,
Channels = header.ToUInt16 (0x16),
SamplesPerSecond = header.ToUInt32 (0x18),
AverageBytesPerSecond = header.ToUInt32 (0x1C) * 2,
BlockAlign = (ushort)(header.ToUInt16 (0x20) * 2),
BitsPerSample = 16,
};
uint input_size = header.ToUInt32 (0x2A);
var samples = new byte[input_size * 2];
Decode (file, samples);
var decoded = new BinMemoryStream (samples, file.Name);
file.Dispose();
return new RawPcmInput (decoded, format);
}
void Decode (IBinaryStream input, byte[] output)
{
int dst = 0;
while (input.PeekByte() != -1)
{
sbyte sample = input.ReadInt8();
LittleEndian.Pack (SampleMap[sample + 128], output, dst);
dst += 2;
}
}
static readonly short[] SampleMap = InitSampleMap();
static short[] InitSampleMap ()
{
var map = new short[256];
for (int i = 1; i <= 127; ++i)
{
map[128 + i] = (short)(Math.Pow (10.0, ((double)i + 44.8637) / 38.0597) - 14.5342);
map[128 - i] = (short)-map[i + 128];
}
map[0] = -0x8000;
return map;
}
}
}